The Azimuth of Pennsylvania Avenue in Washington, D.C. that runs from the Capitol Building Northwest to the White House is 290 degrees. This direction is aligned to the Sunset on Beltane (May 1st) and to the setting of the bright star Aldeberan (the Eye of the Bull) on all days.
Similarly, the Sun on Samhain and the bright star Sirius (every day) Set over the Jefferson Memorial as seen from the Capitol Building along Maryland Ave.This means that Sirius and the Samhain Sun rise over the Capitol as seen from the White House and that Aldeberan and the Beltane Sun rise over the Capitol as seen from the Jefferson Memorial. Equinox Sunrise and Sunset (East - West) connects Capitol Building and Lincoln Memorial. There are Solstice Alignments around the city as well.
Mason Magic perhaps? There are many, many such alignments in DC as well as most major cities. I look forward to showing more of the DC Star Mysteries sometime soon.
Love and Planets,